Eldarerathis summarized it very well. To add some things: The 1.1 version was internally called *Petit Four* by Google, and that's how it all began. Google is installing a giant pastry on their lawn at Mountain View each time a new version is about to be launched.

You can see pictures of that display at different stages here:


![Overall display (Cupcake to Eclair, with Nexus One)][2]

![Honeycomb][3]

![Eclair, Froyo, Gingerbread, Honeycomb and Ice Cream Sandwich][4]

![Gingerbread, Honeycomb, Ice Cream Sandwich and Jelly Bean][5]

![Kit-Kat][6]


  [1]: https://lh5.googleusercontent.com/-_fj468-OLGY/TFDnShiC5UI/AAAAAAAAeBk/navF07o8Rwk/s1024/697567251_img_7634.jpg
  [2]: http://farm5.static.flickr.com/4030/4453391412_8ec6dfa2a8_o.jpg
  [3]: http://eurodroid.com/pics/honeycomb_statue-1.jpg
  [4]: http://www.androidguys.com/wp-content/uploads/2011/10/ice_cream_googleplex.jpg
  [5]: http://s1.uswitchstatic.com/_img/library/news_image/android_jelly_bean_sculpture_at_googleplex_520x300x24_fill.jpg
  [6]: http://www.droid-life.com/wp-content/uploads/2013/09/kitkat-android-650x433.jpg